Satellite Navigation Augmentation System Redundant Computing Centers
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Solution Overview
Problem
Current space-based augmentation systems for satellite navigation face challenges in maintaining short-term availability and continuity due to failures in the main computing center, leading to interruptions in navigation message transmissions and reduced performance during switching between independently generated message sequences.
Innovation Solution
A spatial augmentation system with redundant computing centers synchronized on a master center, using a communication network to select the best navigation message streams based on quality of service and hysteresis mechanisms to minimize switching, and employing a local network for data distribution to ensure consistent message sequences and fast synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple computing centers operate independently to provide redundancy, then system reliability is improved, but message sequence consistency deteriorates during switching
Solution Approach 1:
The system divides computing centers into hierarchical groups (geographical centers with local computing centers) to enable independent operation within segments while maintaining overall consistency through synchronized segments
Solution Approach 2:
A master computing center acts as an intermediary that receives data from receiving stations and distributes synchronized navigation messages to slave computing centers, ensuring message sequence consistency across the network
2Stability of the object's composition
If a single master computing center is used, then message sequence consistency is improved, but system reliability deteriorates due to single point of failure
Solution Approach 1:
The system segments computing centers into master and slave roles within geographical centers, allowing distributed redundancy while maintaining synchronized message sequences through the master center coordination
Solution Approach 2:
The system changes the operational state parameters of computing centers dynamically, allowing slave centers to take over master functions when needed, thus converting from a single-point architecture to a flexible redundant architecture
3Reliability
If computing centers are geographically distributed, then system robustness is improved, but synchronization difficulty increases
Solution Approach 1:
The master computing center serves as a synchronization intermediary that receives data from receiving stations and distributes synchronized navigation messages to slave computing centers across geographical locations, simplifying the synchronization process
Solution Approach 2:
The master computing center performs preliminary synchronization of navigation messages before distribution to slave centers, ensuring that all centers are prepared with consistent data before transmission to user receivers
Data Source
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AI summary
The system has a transmission ground station (7) for transmitting data to a geostationary satellite (9), and a ranging and integrity monitoring station (3) for receiving signals transmitted by a global navigation satellite system (2). Two data centers (5-1a, 5-1b) transmit flow of navigation messages and information representative of quality of service to the ground station, where the transmission ground station selects the flow of navigation messages based on information representative of the quality of service, so as to merge the data centers to a master calculation center. An independent claim is also included for a method for improving the accuracy and reliability of data delivered by a satellite navigation system.